src/kitemviews/kstandarditemlistview.cpp

   1 /***************************************************************************
   2  *   Copyright (C) 2012 by Peter Penz <peter.penz19@gmail.com>             *
   3  *                                                                         *
   4  *   This program is free software; you can redistribute it and/or modify  *
   5  *   it under the terms of the GNU General Public License as published by  *
   6  *   the Free Software Foundation; either version 2 of the License, or     *
   7  *   (at your option) any later version.                                   *
   8  *                                                                         *
   9  *   This program is distributed in the hope that it will be useful,       *
  10  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  11  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  12  *   GNU General Public License for more details.                          *
  13  *                                                                         *
  14  *   You should have received a copy of the GNU General Public License     *
  15  *   along with this program; if not, write to the                         *
  16  *   Free Software Foundation, Inc.,                                       *
  17  *   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA            *
  18  ***************************************************************************/
  19
  20 #include "kstandarditemlistview.h"
  21
  22 #include <KIconLoader>
  23 #include "kstandarditemlistwidget.h"
  24
  25 KStandardItemListView::KStandardItemListView(QGraphicsWidget* parent) :
  26     KItemListView(parent),
  27     m_itemLayout(DetailsLayout)
  28 {
  29     setAcceptDrops(true);
  30     setScrollOrientation(Qt::Vertical);
  31     setVisibleRoles({"text"});
  32 }
  33
  34 KStandardItemListView::~KStandardItemListView()
  35 {
  36 }
  37
  38 void KStandardItemListView::setItemLayout(ItemLayout layout)
  39 {
  40     if (m_itemLayout == layout) {
  41         return;
  42     }
  43
  44     beginTransaction();
  45
  46     const ItemLayout previous = m_itemLayout;
  47     m_itemLayout = layout;
  48
  49     setSupportsItemExpanding(itemLayoutSupportsItemExpanding(layout));
  50     setScrollOrientation(layout == CompactLayout ? Qt::Horizontal : Qt::Vertical);
  51
  52     onItemLayoutChanged(layout, previous);
  53
  54     endTransaction();
  55 }
  56
  57 KStandardItemListView::ItemLayout KStandardItemListView::itemLayout() const
  58 {
  59     return m_itemLayout;
  60 }
  61
  62 KItemListWidgetCreatorBase* KStandardItemListView::defaultWidgetCreator() const
  63 {
  64     return new KItemListWidgetCreator<KStandardItemListWidget>();
  65 }
  66
  67 KItemListGroupHeaderCreatorBase* KStandardItemListView::defaultGroupHeaderCreator() const
  68 {
  69     return new KItemListGroupHeaderCreator<KStandardItemListGroupHeader>();
  70 }
  71
  72 void KStandardItemListView::initializeItemListWidget(KItemListWidget* item)
  73 {
  74     KStandardItemListWidget* standardItemListWidget = qobject_cast<KStandardItemListWidget*>(item);
  75     Q_ASSERT(standardItemListWidget);
  76
  77     switch (itemLayout()) {
  78     case IconsLayout:   standardItemListWidget->setLayout(KStandardItemListWidget::IconsLayout); break;
  79     case CompactLayout: standardItemListWidget->setLayout(KStandardItemListWidget::CompactLayout); break;
  80     case DetailsLayout: standardItemListWidget->setLayout(KStandardItemListWidget::DetailsLayout); break;
  81     default:            Q_ASSERT(false); break;
  82     }
  83
  84     standardItemListWidget->setSupportsItemExpanding(supportsItemExpanding());
  85 }
  86
  87
  88 bool KStandardItemListView::itemSizeHintUpdateRequired(const QSet<QByteArray>& changedRoles) const
  89 {
  90     // The only thing that can modify the item's size hint is the amount of space
  91     // needed to display the text for the visible roles.
  92     // Even if the icons have a different size they are always aligned within
  93     // the area defined by KItemStyleOption.iconSize and hence result in no
  94     // change of the item-size.
  95     foreach (const QByteArray& role, visibleRoles()) {
  96         if (changedRoles.contains(role)) {
  97             return true;
  98         }
  99     }
 100     return false;
 101 }
 102
 103 bool KStandardItemListView::itemLayoutSupportsItemExpanding(ItemLayout layout) const
 104 {
 105     return layout == DetailsLayout;
 106 }
 107
 108 void KStandardItemListView::onItemLayoutChanged(ItemLayout current, ItemLayout previous)
 109 {
 110     Q_UNUSED(current);
 111     Q_UNUSED(previous);
 112     updateLayoutOfVisibleItems();
 113 }
 114
 115 void KStandardItemListView::onScrollOrientationChanged(Qt::Orientation current, Qt::Orientation previous)
 116 {
 117     Q_UNUSED(current);
 118     Q_UNUSED(previous);
 119     updateLayoutOfVisibleItems();
 120 }
 121
 122 void KStandardItemListView::onSupportsItemExpandingChanged(bool supportsExpanding)
 123 {
 124     Q_UNUSED(supportsExpanding);
 125     updateLayoutOfVisibleItems();
 126 }
 127
 128
 129 void KStandardItemListView::polishEvent()
 130 {
 131     switch (m_itemLayout) {
 132     case IconsLayout:   applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_LargeIconSize), 2, 4, 8); break;
 133     case CompactLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize),  2, 8, 0); break;
 134     case DetailsLayout: applyDefaultStyleOption(style()->pixelMetric(QStyle::PM_SmallIconSize),  2, 0, 0); break;
 135     default:            Q_ASSERT(false); break;
 136     }
 137
 138     QGraphicsWidget::polishEvent();
 139 }
 140
 141 void KStandardItemListView::applyDefaultStyleOption(int iconSize,
 142                                                     int padding,
 143                                                     int horizontalMargin,
 144                                                     int verticalMargin)
 145 {
 146     KItemListStyleOption option = styleOption();
 147
 148     bool changed = false;
 149     if (option.iconSize < 0) {
 150         option.iconSize = iconSize;
 151         changed = true;
 152     }
 153     if (option.padding < 0) {
 154         option.padding = padding;
 155         changed = true;
 156     }
 157     if (option.horizontalMargin < 0) {
 158         option.horizontalMargin = horizontalMargin;
 159         changed = true;
 160     }
 161     if (option.verticalMargin < 0) {
 162         option.verticalMargin = verticalMargin;
 163         changed = true;
 164     }
 165
 166     if (changed) {
 167         setStyleOption(option);
 168     }
 169 }
 170
 171 void KStandardItemListView::updateLayoutOfVisibleItems()
 172 {
 173     if (model()) {
 174         foreach (KItemListWidget* widget, visibleItemListWidgets()) {
 175             initializeItemListWidget(widget);
 176         }
 177     }
 178 }
 179